Icon for a display screen



The FIGURE is a front view of a icon for a display screen showing my new design.

The areas within the four squares defined by broken lines are not part of the claimed design. The broken line drawing of a square immediately surrounding the solid line disclosure is not part of the claimed design. The broken line drawing of a display screen is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a icon for a display screen, as shown and described. 